Cold Roof vs Warm Roof

Is there the telltale sign of damp creeping across your ceiling?

But, what exactly is the difference, and why should you bother getting a warm roof to combat damp?

Well, first of all, damp can be very detrimental to your health. It can give you respiratory issues, or make existing ones worse. It can even affect your immune system, which is bad news for everyone. It also doesn’t look very nice when there’s lots of black spots all around the house. 

Below is a case study of a recent customer who had no end of problems until we changed the roof over from a cold roof system to a warm roof.

The home was covered in spots of mould and damp. They had a flat, cold roof. 


We converted the flat, cold roof into a warm roof adding a slight inversion to prevent water from pooling (another factor to the mould). 

Next up, a little lesson on roof construction.

A cold roof is probably what you currently have in your home – conventionally, it’s how they’ve been built, or the way they have been retrospectively insulated if your home is older than the concept of loft insulation. The roof covering – felt or tiles – is at the top, way up there with the rafters and the batons. Then there’s the open space – space that is generally the same temperature as it is outdoors. Just above your ceiling there are joists, and here’s where that stuff that looks like a blanket gets laid (only, it tends to be itchy, so we don’t recommend using it as an actual blanket). A flat roof is similar, except there’s slightly less open space – not enough to convert.

A warm roof also has the same joists above your ceiling, and the same covering right up on the top. The difference is where the insulation is – it’s up there in the rafters just below your tiles or felt. The space in your roof is within that insulated barrier – meaning the temperature reflects the temperature of your house, rather than what’s outside. A warm roof has the same protection against damp as the rest of your house, as your heating keeps the moisture at bay.

For advice on if a warm roof would be right for you, please do get in touch to speak to one of our team. 

And, if you’d like a new roof; whether you need warm or cold, whether you’ve got a pitch you want making flat, or a flat roof you’d like adapting to a pitched, #ChoosePrimus. 

Next week, I’ll be giving you a little intro in Velux roof windows (skylights) and sun tunnels, the gorgeous trend that gives you plenty of natural light. 

T’s roof issues fixed – replacement roof in Liverpool

T in Liverpool gave us a call regarding some poor work that had been performed on his roof. The flat roof above his kitchen was leaking after he’d had someone in to repair it. He wanted a temporary fix so that his kitchen walls wouldn’t suffer permanent damage, followed by a permanent repair. After all of the work was finished, T also received a roof report with information about the exact problems we’d encountered, and what we had done.

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A and J are warm at last – replacement boiler Skelmersdale

We had a lovely “unseasonably mild” December last year, followed by mother nature getting her own back on us with a cold snap in January. With this erratic use, your boiler might not have known what was going on, and it seems like for A and J in Skelmersdale, their boiler decided to give up the ghost and their heating was working erratically and the hot water not working at all. They’d been having problems for a while and it wasn’t workable anymore. Their landlord got in touch with us to see what we could do to get things sorted.

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Get #GasSafe: D. I. Why? – Part Two

Last week it was all the DIY flues and chimneys, and this time Detective Inspector Why is getting to the bottom of some more DIY gas shockers. I’ll reiterate last week’s advice – don’t touch gas if you don’t know what you’re doing! It’s not like plumbing in your new sink yourself – where your biggest risk is a flood and a new floor – people die from gas gone wrong. So, don’t do these below things, or any gas work that you’ve not been trained to do.

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Get #GasSafe: D. I. Why? – Flues and chimneys.

No, not a detective inspector, although I feel maybe there should be a DI for DIY gas jobs. If trained professionals could produce the catalogue of errors I’ve been featuring so far, why would you DIY? If you’re a formerly CORGI Registered engineer or a Gas Safe Registered engineer who’s qualifications have lapsed then you probably do know what you’re doing, but I’d still prefer it if you got someone who is completely up to date with the latest in Gas Safe Regulations! Unlike these five customers and their DIY ruined flues and chimneys.

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